Heat-treating furnace.



T. F. BAIL'Y & F. T. COPE.

HEAT TREATING FURNACE APPLICATION FILED MAY 13, 1915.

Patented May 22, 1917.

2 SHEETS-SHEET I.

Quiet/"e1 T. F- BAILY & F. T. COPE. HEAT TREATING FURNACE. APPLICATION FILED MAY13. 1915.

2 SHEETSSHEET 2.

51 55 28 WM "MWM 5a 27 f; dd f, anion-few d 15 a Z I GMT/mug Patented May 22, 1917.

UNITED STATES PATENT OFFICE.

THADDEUS F. BAILY AND FRANK T. COPE, OF ALLIANCE, OHIO, ASSIGrNORS TO THE ELECTRIC FURNACE COMPANY, OF ALLIANCE, OHIO, A CORPORATION OF OHIO.

HEAT-TREATING FURNACE.

. and FRANK Ti Corn, both citizens of the United States, both residing at Alliance, in the county of Stark and State of Ohio, have invented a new and useful Heat-Treating Furnace, of which the following is a specification.

Our invention relates to improvements in heat treating furnaces and has more especial reference to furnaces adapted to heat billets and the likein which the billets are automatlcally fed into the furnace and discharged therefrom when they have reached a predetermined degree of temperature.

The ob ects of our invention is to provide I a heat treating furnace in which billets or the like are fed automatically and discharged when they have reached a predetermined degree of heat.

Another object is to provide a device of this character in which the mechanism for automatically feeding and discharging the billets is operated by electrical devices controlled by a pyrometer.

With these objects in view the invention consists in the novel construction and arrangement of parts, hereinafter described,

illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size and minor details of construction may be made within the scope of the appended claims without departingfrom the spirit or sacrificing any of the advantages of the invention.

In the drawings:

. Fi ure 1 is a dlagrammatic view of a heat treating furnace and the mechanism adapted to" operate the same shown in the normal position.

Fig. 2 is a similar view showing the parts in the operative position,

Similar numerals of reference indicate corresponding parts in all the figures of the drawings.

' Referring more especially to the construction illustrated in the accompanying drawings, the numeral 1 indicates generally a furnace provided with the entrance and exit openings 2 and 3, respectively,--said openings being normally closed by means of the slid- Specification of Letters Patent.

by the armature 19, a battery 27 Patented May 22, 1917.

Application filed ma 13, 1915. Serial No. 27,795.

ing doors 4 and 5 respectively. A suitable billet support 6 extends through the heating chamber 7 of the furnace, the extremities of said support being extended through the entrance and exit openings 2 and 3 forming stops for the doors 4 and 5 as indicated at 8 and 9, the extremity designated by the numeral 8 which extends out through the entrance opening being preferably of suitable length to form a receiving table upon which the billets may be placed preparatory to being passed into the heating chamber.

A thermo-couple 10 of any usual and well known type is located in the heating chamber adjacent the exit door 3 and is connected by wires 11 with a pyrometer 12 of any suitable construction. The pyrometer 12 is,

provided with an arm 13 connected to a wire 14 upon which wire is located a battery or other suitable source of current 15, said wire being connected to a relay 16, which relay is connected by means of a wire 17 with a contact point 18 upon the pyrometer.

The armature 19 of the relay 16 is connected by means of a wire 20 with the solenoid 28, a wire 30 connecting said solenoid with the contact 26 adapted to be engaged being interposed upon said wire 30. The contact plate 21 is adapted to be engaged by the pivoted arm 22, said contact plate 21 being connected by means of a wire 20 with the solenoid 24, a battery 29 being interposed u on said wire 20. A wire 23 connects the plvoted arm 22 with the solenoid 24:. The

armature 31 and 32 of the solenoids 2-1 and 28 respectively are connected to a rock arm 33 which control the three-way valve 34:.

'A water supply line 35 and a water discharge line 36 are connected to said valve and are adapted to be connected if desired by means of the valve with the pipe 37 whlch supplies the pusher cylinder and door lifting cylinder 38 and 39 respectively. A branch pipe 40' connects the pipe 37 wlth the upper end ofthe pusher cylinder 38. A piston 41 is mounted within the cylinder 38 and the rod 42 thereof is pivotally connected to the arm 43 of a bell crank lever which is pivoted at 44, the arm 45 of said bell crank lever being pivotally attached to a pusher arm 46. A counter-weight 47 is mounted upon a cable 48 which passes over a pulley 49, said cable being'connected to the upper extremity of the arm 45, the counter-weight normally holding the bell crank lever in the position shown in Fig. 1. A finger 50 is provided upon the bell crank lever and adapted to move the pivoted arm 22 into contact with the plate 21. The extremity of the pipe 37 is connected to the lower end of the door lifting cylinder 39 within which cylinder is mounted a piston 51 to the rod 52 of which are connected the cables 53 and 54, respectively, said cables passing over suitable pulleys 55 and carrying the doors 4 and 15 5 respectively.

The billets indicated by the letter A are placed one at a time upon the extension 8 of the billet support as shown in Fig. 1. Theseveral movable parts of the device are then in the normal position as shown in F ig. 1. As the temperature in the rear end of the heating chamber adjacent the thermocouple 10 reaches the proper degree the thermo-couple causes the pyrometer 12 to operate, moving the arm 13 into engagement with the,contact l8 closing the circuit from the battery 15 through the relay 16 and drawing the armature 19 of the relay .into engagement with the contact 26 closing the circuit from the battery 27 through 'the solenoid 28 as shown in Fig. 2. As the armature32 of the solenoid 28 operates the arm 33 is drawn into the position shown'in Fig. 2, operating the valve 34 connecting the pipes 37 with the water supply 35. The water passing through the pipe 37 and through the branch pipe 40 operates the pistons 41 and 51 in the cylinders 38 and 39, opening the doors 4 and 5 and pushing the billet which has been placed. upon the outside of the door 4 into the heating chamber against the other billets located in the heating chamber, moving all of said billets upon the support 6. The billet adjacent the door 45 5 being heated to the proper degree'is then removed from the furnace. As the finger comesinto engagement with the pivoted arm 22 it moves said arm into contact with the contact point 21 closing'the circuit from the battery 29 through the solenoid 24. The temperature within the heating chamber of the furnace will, by this time, have lowered sufficiently to cause the arm 13 of the pyromx eter to move out of contact with the-contact point 18, thus breaking the circuit to the relay .16, allowing the armature 19 thereof to drop out of contact with the plate-26 and breaking the circuit through the-battery 27 to the solenoid. The armature'2l of the solenoid 24 will then be operated, moving the arm 33 back into the position shown in Fig. 1 operating the valve 34, connecting the pipe 37 with the discharge line 36.. The weight of the doors 4 and 5 will then cause .them to close and the counter-weight, 47 will bring the pusher back to the normal position shown in Fig. 1, rocking the bell crank lever and moving the finger 50 away from the pivoted arm 22 allowing said arm to move out of contact with the plate 21, thus deenergizing the solenoid 24.

By the construction above described and illustrated in the accompanying drawings it will be seen that the operation of the furnace is entirely automatic, depending upon the temperature at the discharge end of the heating chamber being raised to the proper degree to operate the pyrometer which controls all of the mechanism. It will be understood that the apparatus diagrammatically shown in the drawings, is merely one of many difl'erent forms of apparatus which may be used to carry out the operation of the furnace without departing from thescribed being merely to illustrate the inven tion.

Although the drawings and above specifications disclose the best mode in which we have contemplated embodying our invention we desire to be not limited to the details of such disclosure, for, in the further practical application of our invention, many changes in form and construction may be made, as

- circumstances require or experience suggests without departing from the spirit of the invention, within the scope of the appended claims.

, We claim 1. A furnace, means formoving the material to be heated through said furnace, a thermally controlled device controlled by the temperature of said furnace, and electrical controlling means forming an operative connection between said thermally controlled device and said means for moving the material through said furnace and controlling the starting and stopping of said means for moving the material through the furnace.

2. A furnace, means for moving the material to be heated through said furnace, a

temperature measuring device adapted to measure the temperature of the material contained in said furnace, and electrical controlling means forming an operative connection between said temperature measuring device and said .means for moving the ma terial through said furnace and controlling a the starting and stopping of said means for moving the material through the furnace.

3. A furnace, electrically controlled means for moving the material to be treated through said furnace, a temperature measuring device adapted to measure the temperature of the material in said furnace, and electrical controlling means forming an operative connection between said temperature measuring device and said electrically controlled means for moving the material through the furnace and controlling the starting and stopping of said means for moving the material through the furnace.

4. A furnace, means for moving the material to be treated through said furnace, an electrically operated device controlling the operation of said means, an electric circuit connected to said electrically o erated device, a temperature measuring evice adapted to measure the temperature of the material in said furnace, and electrical controlling means forming an operative connection between said temperature measuring device and said electrically operated device and controlling the starting and stopping of said means for moving the material 7 through the furnace.

5. In a heat treating furnace, a heating chamber having an inlet opening at one end and an outletopening at the other end thereof, a door provided to normally cover each of said'openings, a temperature measuring device located in said heating chamber, mechanical means for passing material to be treated through said heating chamber,

mechanical means for opening and closing said, doors and electrical controlling means forming an operative connection between said temperature measuring device and both of said mechanical means.

6. A furnace, means for moving the material to be heated through said furnace, a fluid operated device controlling the operation of said means, a temperature measur ing device adapted to measure the temperature of the material in said furnace, and electrical controlling means forming an operative connection between said temperature measuring device andsaid fluid operated device.

7. A furnace, means for moving the material to be treated through said furnace, a fluid operated cylinder arranged to operate said means, an electrically operated device controlling the admission of fluid to said cylinder, a thermally controlled device controlled by the temperature of the material in said furnace, and electrical controllingv means formingan operative connection between said thermally controlled device and said electrically operated device.

8. A furnace, means for moving the material to be treated through said furnace, a fluid operated cylinder arranged to operate said means, an electrically operated device controlling the admission of fluid to said 9. A furnace, means for moving the material to be treated through said furnace, a fluid operated cylinder arranged to operate said means, doors provided upon said furnace, a second fluid operated cylinder controlling the operation of said doors, an electrically operated device controlling the admission of fluid to said cylinders, a temperature measuring device adapted to measure the temperature of the material in the furnace, said temperature measuring device controlling the operation of said electrically operated device.

10. A furnace, means for moving the materialto be treated through said furnace, a fluid operated cylinder arranged to operate said means, doors provided upon said furnace, a second fluid operated cylinder controlling the operation of said doors, an electrically operated device controlling the admission of fluid to said cylinders, a temperature measuring device adapted to measure the temperature of the material in the furnace, said temperature measuring device controlling the operation of said electrically operated device, and means for automatically exhausting the fluid from said cylinders after each operation of the same.

11. A furnace, a pusher for moving the material to be treated through said furnace, means for operating said pusher, a temperature measuring device adapted to measure the temperature of the heating chamber of said furnace, and means forming an operative connection between said temperature measuring device and said means for operating said pusher.

12. In a heat treating furnace, a heating chamber having an entrance end and an exit end, means for applying heat to said chamher, said heat being at a maximum near the exit end, a temperature measuring device near the exit end, means for forcing material to be heat treated from the entrance end toward the exit end, said means being controlled by the temperature measuring device.

13. In a heat treating furnace, a heating chamber, a temperature measuring device located in said chamber, mechanical means for passing material to be treated through said heating chamber,

between said temperature measuring device and said mechanical means.

electrical controlling and electrical con trolling means forming an operative connectlon 14. A furnace, means for moving the mameans for moving the material, doors provided upon said furnace, a second mechanical means controlling the operation of said doors, an electrically operated device controlling both of said mechanical means, and a temperature measuring device adapted to measure the temperature of the material in the furnace, said temperature measuring device controlling the operation of said electrically operated device.

15. A\ heat treating furnace, a heating chamber provided with an entrance opening and an exit opening at opposite ends thereof, a material support located within said heating chamber, the extremities thereof extending through said openings and forming a receiving table adjacent the entrance opening and an inclined chute through the exit opening, a temperature measuring device located in said chamber, mechanical means for passing material to be treated through said heating chamber upon said material support and electrical controlling means forming an operative connection between said temperature measuring device and said mechanical means.

16. In a heat treating furnace, a heating chamber provided with an entrance opening at one extremity thereof and an outlet opening at the other extremity thereof, doors arranged to normally close said openings, a temperature measuring device located in said heating chamber, mechanical means for passing material to be treated through said heat- In testimony that we claim the above, we

have hereunto subscribed our names.

THADDEUS F. BAILY. FRANK T. CUBE. 

